The separation between successive fringes in a double slit arrangement is x. If the whole arrangement is dipped under water, what will be the new fringe separation ? [The wavelength of light being used is `5000 Å`]

Options

A. 1.5 x
B. x
C. 0.75 x
D. 2 x

Answer

C

Explanation

When the arrangement is dipped in water,
`beta'=(beta)/(mu)=(x)/(4//3)=(3)/(4)x=0.75x`